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This article mainly shares with you the PHP implementation of splicing SQL statements to batch update multiple fields. I hope it can help you.
1. SQL statement
1. Update a field in batches:
UPDATE `user`
SET `name` = CASE id
WHEN 1 THEN '张三'
WHEN 2 THEN '李四'
WHEN 3 THEN '王五'
END
WHERE id IN (1,2,3)
this The meaning of the SQL statement is to update the name field of the user table. If id=1, the value of name is Zhang San. If id=2, the value of name is Li Si.
2. Update multiple fields in batches:
UPDATE `user`
SET
`name` = CASE id
WHEN 1 THEN '张三'
WHEN 2 THEN '李思'
WHEN 3 THEN '王五'
END,
age = CASE id
WHEN 1 THEN 16
WHEN 2 THEN 17
WHEN 3 THEN 18
END
WHERE id IN (1,2 ,3)
2. Case
/
/@todo 去除表中电话和传真的 '-' //表的最小ID是1,最大ID是121329;fax和phone都是varchar类型 //每次查询100条数据,拼接sql语句批量更新 public function updeAction(){ set_time_limit(0); $mGather = new ClientGatherModel(); //$mGather->setDb('gather'); //读线上gather库[区分线上和线下数据库] $cnt = 0; $minId = 1; $maxId = 121329; //每次最多插入100条数据,程序拼接 for ($x=$minId; $x<=$maxId; $x+=100){ $littleMax = $x+99; $querySql = "select * from crm_client_gather where id>=$x and id <=$littleMax order by id asc"; $result = $mGather->query($querySql); $data = []; $sql = ""; if($result){ foreach ($result as $k => $v){ $fax = $v['fax'] ? $v['fax'] : ''; $phone = $v['phone'] ? $v['phone'] : ''; $id = $v['id']; if($fax || $phone ){ if($fax && strstr($fax, '-')){ $fax = substr($fax,strpos($fax,'-')+1); //截取第一个 - 后面的内容 } if($phone && strstr($phone, '-')){ $phone = substr($phone,strpos($phone,'-')+1); //截取第一个 - 后面的内容 } } $data[] = ['id'=>$id,'fax'=>$fax,'phone'=>$phone]; } if($data){ $sql .= " UPDATE crm_client_gather SET fax = CASE id "; $faxArr = array_column($data, 'fax', 'id'); foreach ($faxArr as $k => $v){ $sql .= " WHEN {$k} THEN '{$v}' "; } $sql .= " END, "; $phoneArr = array_column($data, 'phone','id'); $sql .= " phone = CASE id "; foreach ( $phoneArr as $k => $v ){ $sql .= " WHEN {$k} THEN '{$v}' "; } $sql .= ' END '; $idArr = array_column($data, 'id'); $sql .= " WHERE id IN ( "; foreach ($idArr as $k => $v){ if($idArr[count($idArr)-1] == $v ){ $sql .= $v; }else{ $sql .= $v.','; } } $sql .=")"; $mGather->query($sql); if( $littleMax > $maxId ){ $biggerId = $maxId; }else{ $biggerId = $littleMax; } echo "ID:[{$x}]-[$biggerId] 更新了 [".count($data)."]条数据 ";//打印进度 } } } }
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